(under subclass 412) Frameworks or structures for the support of sifters or frames carrying sifter elements and which have means whereby said frameworks or structures may be adjusted to alter the position of the sifting elements or frames carrying such or adapt the supporting framework or devices to particular locations.
SEE OR SEARCH THIS CLASS, SUBCLASS:
319, for adjustable plural superposed plane, horizontal or inclined sifters.
421, for sifters adapted to be mounted on a vehicle.
